Chapter I: II (9)

Facsimile Telegraph 510 Factor, Armature 45 Fahrenheit Scale 248 Fall of Potential 430 False Poles, Magnetic 350 Farad 248 Faraday, Effect 249 Faraday's Cube 249 Faraday's Dark Space 249, 489 Faraday's Disc 249 Faraday's Net 250 Faraday's Ring 473 Faraday's Transformer 250 Faraday's Voltameter 250 Faradic 250 Faradic Battery 63 Faradic Brush 251 Faradic Current 162 Faradic Excitability 246 Faradization 251 Faradization, Galvano- 265 Far Leading Dynamo 198 Fault of a Dynamo, Ironwork 308 Faults 251 Faults, Contact 147 Feed Clockwork 128 Feeder 251 Feeder, Equalizer 251 Feeder, Main or Standard 251 Feeder, Negative 251 Feeder, Neutral 251 Feeder, Positive 251 Feeder, Switch 500 Feet, Ampere 30 Ferranti Effect 251 Ferric Chloride Battery 63 Ferro-magnetic 252 Fibre and Spring Suspension 252 Fibre Suspension 252 Field, Air 252 Field, Alternating 252 Field and Armature Reaction of Dynamo, 450 Field, Controlling 148 Field, Deflecting 178 Field Density 252 Field, Distortion of 252 Field, Drag of 254 Field, Intensity of a Magnetic 306 Field Magnet 337 Field of Force . 254 Field of Force, Electro-magnetic 218 Field of Force, Electrostatic 254 Field of Force, Magnetic 344 Field of Force of a Current 255 Field of Force, Uniform 553 Field, Pulsatory 256 Field, Rotating 256 Field, Stray 256, 495 Field, Uniform 256 Field, Uniform Magnetic 345 Field, Waste 256 Figure of Merit 256 Figures, Haldat's 284 Figures, Lichtenberg's 327 Figures, Magnetic 345 Filament 256 Filament, Magnetic 345 Filaments, Paper 402 File, Circuit Breaker 121 Finder, Position 427 Finder, Range 447 Finder, Wire 580 Fire Alarm, Electric Automatic 257 Fire and Heat Alarm 17 Fire Extinguisher, Electric Automatic 257 Fire Cleansing 257 Fire, St. Elmo's 494 Fishing Box 311 Flashing in a Dynamo or Magneto-Electric Generator 257 Flashing of Incandescent Lamp Carbons 257 Flashing Over 258 Flash, Side 484 Flat Cable 96 Flat Coil 133 Flat Ring Armature 45 Flats 258 Flats in Commutator 140 Flexible Cord 152 Floating Battery, De la Rive's 179 Floating Magnets, Meyer's 370 Floor Matting, Electric 369 Floor Push 258 Fluid, Depolarizing 258 Fluid, Electric 258 Fluid, Electropoion 232 Fluid, Insulator. 306 Fluid, North Magnetic 357 Fluids, Magnetic 345 Fluid, South Magnetic 356 Fluid Theory, Single 486 Fluorescence 258 Flush Boxes 258 Fluviograph 259 Flux, Magnetic 345 Fly or Flyer, Electric 259 Foci Magnetic 259 Fog, Electric 259 Following Horns 259 Foot-candle 259 Foot, Mil- 379 Foot-pound 259 Foot-step 259 Force 259 Force, Annular 544 Force, Axial 544 Force, Centrifugal 112 Force, Coercive or Coercitive 131-471 Force, Controlling 148 Force, Counter-electro-motive 156 Force de Cheval 260 Force, Electro-magnetic 260 Force, Electro-motive 227 Force, Electro-motive, Transverse 549 Force, Electrostatic 260 Force, Field of 254 Force, Field of, of a Current 255 Force, Field of, Electrostatic 254 Force, Kapp Line of 312 Force, Lines of 330 Force, Magnetic 346 Force, Magnetic Field of 344 Force, Magnetic Lines of 348 Force, Magneto-motive 365 Force, Motor Electro-motive 384 Force of Polarization, Back Electro-motive 156 Force, Oscillatory, Electro-motive 398 Force, Photo-electro-motive 410 Forces, Composition of 260 Forces, Parallelogram of 260 Forces, Resolution of 261 Force, True Contact 549 Force, Tubes of 261 Force, Unit of 261 Forked Circuits 126 Fork, Tuning, Dynamo 202 Forming 261 Formula of Merit 256 Foucault Current 163 Foundation Ring 261 Fourth State of Matter 261 Frame 261 Frame, Resistance 465 Franklinic Current 163 Franklin's Experiment 261 Franklin's Plate 262 Franklin's Theory 262-486 Free Charge 115 Free Magnetism 356 Frequency 262 Frequency, High 289 Frictional Electricity 262 Frictional Electric Machine 333 Frictional Heating 262 Friction Gear, Magnetic 276 Friction, Magnetic 295-346 Fringe 262 Frog, Galvani's Experiment with 262 Frog, Rheoscopic 262 Frying 263 Fulgurite 263 Fuller's Battery 63 Fulminating Pane 262 Fundamental Unit 554 Furnace, Electric 263 Fuse Block 175 Fuse Board 263 Fuse Box 263 Fuse, Cockburn 263 Fuse, Electric 264 Fuse Links 330 Fuse, Safety 175-475

Galvanic 264 Galvanic Action, Volta's Law of 568 Galvanic Dosage 190 Galvanic Element 264 Galvanic Excitability 247 Galvanic or Voltaic Battery 76 Galvanic or Voltaic Circle 119 Galvanic or Voltaic Couple 156 Galvanic Polarization 265 Galvani's Experiment with Frog 262 Galvanism 265 Galvanization 265 Galvanization, Labile 265 Galvanized Iron 265 Galvano-cautery 109 Galvano-cautery, Chemical 265 Galvano-electric Cautery 109 Galvano-faradization 265 Galvanometer 265 Galvanometer, Absolute 266 Galvanometer, Aperiodic 266 Galvanometer, Astatic 266 Galvanometer, Ballistic 267 Galvanometer Constant 268 Galvanometer, Differential 268 Galvanometer, Direct Reading 269 Galvanometer, Marine 269 Galvanometer, Mirror 271 Galvanometer, Potential 269 Galvanometer, Proportional 269 Galvanometer, Quantity 269 Galvanometer, Reflecting 270 Galvanometer, Shunt 271-483 Galvanometer, Sine 271 Galvanometer, Tangent 272 Galvanometer, Torsion 273-544 Galvanometer, Upright 274 Galvanometer, Vertical 274 Galvanometer, Volt and Ampere Meter 274 Galvano-plastics 275 Galvano-puncture 232-275 Galvanoscope 275 Galvano-thermal Cautery 100 Gap, Spark 490 Gas Battery 63 Gas Battery, Grove's 281 Gas Burner, Electric 93 Gas, Carbonic Acid 108 Gas, Electrolytic 275 Gases, Magnetism of 357 Gases, Mixed 275 Gas Jet, Carcel 108 Gas, Olefiant 397 Gassing 275 Gassiot s Cascade 275 Gastroscope 275 Gas Voltameter 564 Gauge, Battery 64 Gauge, Electrometer 226 Gauss 275 Gauss' Principle 276 Gauss, Tangent Positions of 276 Gauze Brush, Wire 92 Gear, Magnetic 346 Gear, Magnetic Friction 276 Geissler Pump 437 Geissler Tubes 276 Generating Plate 277 Generator, Current 277 Generator Inductor 199 Generator, Magneto-electric 362 Generator, Magneto-electric, Flashing in a Dynamo or 257 Generator, Motor 384 Generator, Pyromagnetic. 442 Generators and Motors, Commutator of Current 140 Generator, Secondary 277-477 Geographic Meridian 372 German Mile Unit of Resistance 466 German Silver 277 German Standard Candle 99 Gilding, Electro- 277 Gilding Metal 277 Gimbals 278 Girder Armature 49 Glass 278 Globe or Globular Lightning 330 Glow Discharge 187 Gold 278 Gold Bath 279 Gold Leaf Electroscope 233 Gold Stripping Bath 279 Governor, Centrifugal 113 Governor, Rate 449 Graduator 279 Gram 280 Gram-atom 280 Gram-molecule 280 Graphite 280 Gravitation 280 Gravity, Acceleration of 280 Gravity Ammeter 27 Gravity Battery 64 Gravity, Centre of 112 Gravity Control 281 Gravity Drop Annunciator 35 Grease Spot 92 Green Vitriol 562 Grenet Battery 65 Grid 281 Grid Plug 420 Grip, Cable 96 Gross Efficiency 205 Ground 281 Grounded Circuit 123 Ground Plate 417 Ground Wire 281 Grove's Battery 65 Grove's Gas Battery 281 Guard Ring 282 Guard Tube 282 Gun, Electro-magnetic 282 Gutta Percha 282 Gyration, Centre of 112 Gyrostatic Action of Armatures 283

H 283 H Armature 49 Haarlem Magnet 337 Hair, Removal of, by Electrolysis 283 Haldat's Figures 284 Hall Effect 284 Hall Effect, Real 284 Hall Effect, Spurious 284 Halleyan Lines 308 Hall's Experiment 284 Halske's and Siemens' Battery 72 Hand Hole 190 Hanger Board 284 Hanger, Cable 96 Hanger, Cable, Tongs 97 Harcourt's Pentane Standard 406 Hare's Deflagrator 73 Harmonic 23 Harmonic Curve 174, 485 Harmonic Motion, Simple 486 Harmonic Receiver 284, 451 Head Bath, Electric 284 Head-light, Electric 285 Head, Torsion 544 Heat 285 Heat and Fire Alarm 17 Heat, Atomic 52, 285 Heat, Electric 285 Heat, Electric, Convection of 149, 286 Heat, Irreversible. 286 Heat, Mechanical Equivalent of 286 Heat, Molecular 286 Heat, Specific 286 Heat, Specific, of Electricity 288 Heat Units 288 Heater, Electric 286 Heating, Admiralty Rules of 12 Heating Error 286 Heating, Frictional 262 Heating Magnet 286 Heavy Carburetted Hydrogen, 397 Hecto 288 Hedgehog Transformer 548 Heliograph 288 Helix 288 Henley's Universal Discharger 189 Henry 288 Henry's Coils 138 Hermetically Sealed 289 Hertz's Experiments 470 Heterostatic Method 280 Hexode Working 581 High Bars of Commutator 289 High Frequency 289 High Vacuum 557 Hinged Armature 45 Hinged Electro-magnet 217 Hissing 289 Hittorf's Resistance 466 Hittorf's Solution 289 Hoffer's Method of Magnetization 360 Hole Armature 45 Hole, Hand 190 Holders 289 Holder, Brush 91 Holder, Candle 99 Holders, Carbon 107 Holophote Lamp 321 Holtz's Influence Machine 334 Home Station 493 Hood 290 Horizontal Induction 302 Horns 290 Horns, Driving 132 Horns, Following 259 Horns, Leading 324 Horns, Trailing 259 Horse Power 290 Horse Power, Actual 290 Horse Power Curve 171 Horse Power, Electric 290 Horse Power Hour 290 Horse Power, Indicated 290 Horseshoe Magnet 337 Hour, Ampere- 30 Hour, Horse Power 290 H. P. 290 Hughes' Electro-magnet 291 Hughes' Induction Balance 291 Hughes' Sonometer 488 Hughes' Telegraph 511 Hughes' Theory of Magnetism 357 Hughes' Type Printer 511 Human Body, Resistance of 467 Hydrochloric Acid Battery 66 Hydro-electric 293 Hydro-electric Machine 293 Hydrogen 294 Hydrogen, Carburetted, Heavy 397 Hydrometer, Beaumé 78 Hygrometer 294 Hyperbolic Logarithms 389 Hysteresis 295 Hysteresis, Magnetic 294 Hysteresis, Static 295 Hysteresis, Viscous 295, 356

Idioelectrics 295 Idiostatic Method 295 Idle Coils 295 Idle Poles 296 Idle Wire 291 Igniter 296 I. H P. 296 Illuminating Power 296 Illuminating Power, Spherical 296 Illuminating Power, Standard of, Viole's 561 Illumination, Unit of 296 Image, Electric 296 Imbricated Conductor 146 Immersion, Simple 185 Impedance 297, 462 Impedance, Impulsive 297 Impedance, Oscillatory 297 Impressed Electro-motive Force 297 Impulse 297 Impulsive Discharge 188 Impulsive Impedance 297 In-and-out, Soaking 486 Incandescence, Electric 297 Incandescent Lamp 321 Incandescent Lamp Carbons, Flashing of 257 Incandescent Lamp, Chamber of 113 Incandescent Lamp, Life of 327 Incandescent Lamp, Three Filament 322 Inclination Compass 142 Inclination, Magnetic 346 Inclination Map 297 Inclination or Dip, Angle of 33 Incomplete Circuit 125 Increment Key 314 Independence of Currents in Parallel Circuits 297 India Rubber 102 Indicated Horse Power 290 Indicating Bell 80, 297 Indicator 298 Indicator, Circuit 298 Indicator, Throw-back 540 Indicator, Volt 568 Indifferent Electrode 210 Indifferent Point 421 Induced Current 163 Induced Magnetization, Coefficient of 354, 359 Inductance 298 Inductance Balance 293 Inductance Bridge 293 Induction, Anti-, Conductor 36 Induction, Back 55 Induction Balance, Hughes 291 Induction, Coefficient of Magnetic 349 Induction, Coefficient of Mutual 301 Induction, Coefficient of Self- 298 Induction Coil 133 Induction Coil, Inverted 136 Induction Coil, Telephone 137, 526 Induction, Cross 298 Induction Current 163 Induction, Electro-magnetic 218, 299 Induction, Electrostatic 302 Induction, Electrostatic, Coefficient of 234 Induction, Horizontal 302 Induction, Lateral 302 Induction, Lines of 330 Induction, Magnetic 302, 346 Induction, Magnetic, Apparent Coefficient of 346 Induction, Magnetic, Coefficient of 346 Induction, Magnetic Dynamic 347 Induction, Magnetic, Self- 352 Induction, Magnetic Static 347 Induction, Magnetic, Tube of 347 Induction, Mutual, Electro-magnetic 302 Induction, Mutual, Electrostatic 303 Induction, Open Circuit 303 Induction, Oscillatory 398 Induction Protector, Mutual 481 Induction, Self- 303 Induction Sheath 303 Induction. Unipolar 304 Induction, Unit of Self- 304 Induction, Vertical 304 Inductive Capacity, Magnetic 346, 349 Inductive Effect, Counter- 204 Inductive Resistance 466 Inductophone 304 Inductor 305 Inductor Dynamo 199 Inductor Generator 199 Inductor, Magneto- 363 Inductor, Pacinotti's 400 Inductorium 138 Inertia 305 Inertia, Electro-magnetic 305 Inertia, Magnetic 347 Infinity Plug 305, 420 Influence, Electric 305 Influence Machine 334 Influence Machine, Armature of 46 Influence Machine, Holtz 334 Influence, Magnetic 346 Installation 305 Instantaneous Capacity 102 Insulating Stool 305 Insulating Tape 305 Insulating Varnish 306 Insulation, Electric 305 Insulation, Magnetic 347 Insulation, Oil 396 Insulation Resistance 466 Insulator 306 Insulator Caps 306 Insulator, Fluid 306 Insulator, Line or Telegraph 306 Intensity 306 Intensity Armature 45 Intensity Current 163 Intensity, Electro-motive 228 Intensity, Magnetic 348 Intensity of a Magnetic Field 306 Intensity of Magnetization 360 Intensity, Poles of 426 Inter-air Space 489 Intercrossing 307 Interference, Armature 45 Interferric Space 489 Interior Pole Dynamo 191 Interlocking- Electro-magnets. 229 Intermediate Metals, Law of 323 Intermittent, 307 Internal Characteristic 114 Internal Resistance 466 lnterpolar Conductor 307 Interpolar Region 307 Interpolation 307 Interrupter, Electro-magnetic, for Tuning Fork 307 Intrinsic Efficiency 205 Invariable Calibration 97 Inverse Induced Current 163 Inverse Squares, Law of 323 Inversion, Thermo-electric 533 Ions 307 Iron 308 Ironclad Dynamo 200 Ironclad Electro-magnet, 219 Ironclad Magnet 356 Iron Disc Ammeter, Eccentric 27 Iron, Electrolytic 308 Iron, Galvanized 265 Ironwork Fault of a Dynamo 308 Irreversible Heat 286 Isochasmen Curve 171 Isochronism 308 Isoclinic Lines 308 Isoclinic Map 308 Isodynamic Lines 308 Isodynamic Map 308 Isoelectric Points 422 Isogonal Lines 308 Isogonic Map 309 Isolated Distribution 309 Isolated Plant 309 Isolated Supply 309 Isotropic 309 Isthmus Method of Magnetization 360 I. W. G., 309

J 309 Jablochkoff Candle 160 Jack. Spring- 492 Jacketed Magnet 356 Jacobi's Law 309 Jacobi's Method of Magnetization 360 Jacobi's Unit of Current 163 Jacobi's Unit of Resistance 466 Jamin Candle 100 Jar, Leyden 325 Jar, Lightning 330 Jar, Luminous 332 Jars, Leyden, Charging and Discharging 108 Jar, Unit 554 Jewelry 309 Joulad 311 Joule 311 Joule Effect 311 Joule's Electro-magnet 337 Joule's Equivalent, 311 Joint, American Twist 309 Joint, Britannia 309 Joint, Butt 310 Joint Current 160 Joint, Lap 310 Joint, Marriage 310 Joint, Resistance 464 Joints in Belts 311 Joint, Sleeve 310 Joint, Splayed 311 Junction Box 311 Junction, Thermo-electric 533

K. 311 Kaolin 311 Kapp. Line of Force 312 Kathelectrotonus 312 Kathode 312 Kathodic Closure Contraction 312 Kathodic Duration Contraction 312 K. C. C. 312 K. D. C. 312 Kempe's Discharge Key 315 Keeper 312 Kerr Effect 235, 312 Kerr's Experiment 312 Key 313 Key Board 313 Key, Bridge 313 Key, Double Contact 314 Key, Double Tapper 314 Key, Charge and Discharge 313 Key, Increment 314 Key, Kempe's Discharge 315 Key, Magneto-electric 315 Key, Make and Break 316 Key, Plug 316 Key, Reversing 316 Key, Sliding-contact 316 Key, Telegraph 316 Kicking Coil 132 Kilo 316 Kilodyne 316 Kilogram 317 Kilojoule 317 Kilometer 317 Kilowatt 317 Kine 317 Kinnersley's Thermometer 536 Kinetics, Electro- 211 Kinetic Energy 241 Kirchoff's Laws 317 Knife Break Switch 501 Knife Edge Suspension 317 Knife Edge Switch 501 Knife Switch 501 Knot 317 Kohlrausch's Law 317 Kookogey's Solution 318 Krizik's Cores 318

L 318 Lag, Angle of 33, 318 Lag, Electric 332 Lag, Magnetic 348 Lalande & Chaperon Battery 69 Lalande-Edison Battery 69 Lamellar Distribution of Magnetism 357 Laminated 318 Laminated Core 154 Laminated Core, Tangentially 155 Lamination 318 Lamination of Armature Conductors 319 Lamination of Magnet 361 Lamp, Arc 319 Lamp, Arc, Double Carbon 191 Lamp Carbons, Flashing of Incandescent 257 Lamp, Carcel 108 Lamp, Contact 320 Lamp, Differential Arc 320 Lamp Globe, Waterproof 572 Lamp, Holophote 321 Lamp-hour 321 Lamp, Incandescent 321 Lamp, Incandescent, Chamber of 113 Lamp, Incandescent, Three Filament 322 Lamp, Life of Incandescent 327 Lamp, Lighthouse 322 Lamp, Monophote 321 Lamp, Pilot 323 Lamp, Polyphote 323 Lamp, Semi-Incandescent 323 Lamp-socket 323 Lamps, Bank of 323 Lane's Electrometer 226 Langdon Davies' Rate Governor or Phonophone 450 Lenz's Law 325 Lap Joint 310 Lap Winding 570 Latent Electricity 323 Lateral Discharge 188 Lateral Induction 302 Latitude, Magnetic 348 Law, Jacobi's 309 Law, Kohlrausch's 317 Law, Lenz's 325 Law of Angular Currents 165 Law of Electrolysis 213 Law of Intermediate Metals 323 Law of Inverse Squares 323 Law of Magnetic Attraction and Repulsion. Coulomb's 338 Law of Successive Temperatures 324 Law, Magnus' 367 Law, Ohm's 396 Law, Pflüger's. 409 Law, Right Handed Screw 324 Law, Sine 486 Laws, Kirchoff's 317 Laws of Thermo-electricity, Becquerel's 78 Law, Tangent 502 Law, Voltametric 567 Lead 324 Lead, Angle of 33 Lead Chloride Battery 66 Lead of Brushes 90 Lead of Brushes, Negative 324 Lead, Peroxide of, Battery 69 Lead Sulphate Battery 66 Lead Tee 504 Leading Horns 324 Leading-in Wires 324 Leak 324 Leakage 324 Leakage Conductor 325 Leakage, Electro-magnetic 219 Leakage, Magnetic. 348 Leakage, Surface 498 Leclanché Agglomerate Battery 66 Leclanché Battery 66 Leg of Circuit 325 Legal Ohm 395 Legal Quadrant 444 Legal Volt 568 Length of Spark 490 Letter Boxes, Electric 325 Leyden Jar 325 Leyden Jar, Armature of 46 Leyden Jars, Battery of 68 Leyden Jars, Charging and Discharging 108 Leyden Jars, Sir William Thomson's 326 Lichtenberg's Figures 327 Life Curve 171 Life of Incandescent Lamp 327 Light, Electro-magnetic, Theory of 219 Light, Maxwell's Theory of 369 Lighthouse Lamp 322 Lightning 327 Lightning Arrester 328 Lightning Arrester, Counter-electro-motive Force 329 Lightning Arrester Plates 329 Lightning Arrester, Vacuum 329 Lightning, Ascending 330 Lightning, Globe or Globular 330 Lightning Jar 330 Lightning, Back Stroke or Shock of 55 Lime, Chloride of, Battery 61 Limit, Magnetic 348 Limit of Magnetization 361 Linear Current 164 Lineman's Detector 180 Line of Commutator, Neutral 300 Line of Contact 330 Line of Force, Kapp 312 Line of Magnet, Neutral 361 Line or Telegraph Insulator 306 Lines, Halleyan 308 Lines, Isoclinic 308 Lines, Isodynamic 308 Lines, Isogonal 308 Lines, Isogonic 308 Lines of Force 330 Lines of Force, Cutting of 175 Lines of Force, Electro-magnetic 219 Lines of Force, Electrostatic 234 Lines of Force, Magnetic 348 Lines of Induction 330 Lines of Slope 330 Lines or Points of Least Sparking 490 Lines, Trunk 550 Links, Fuse 330 Liquids, Electro-dynamic Rotation of 474 Liquids, Electro-magnetic Rotation of 475 Liquor, Spent 491 Listening Cam 330 Lithanode 331 Load 331 Load Curve 172 Load of Armature 46 Local Action 331 Local Battery 331 Local Circuit 331 Local Currents 163, 331 Localization 331 Locus 331 Lodestone 332 Logarithm 332 Logarithms, Hyperbolic 389 Logarithms, Napierian 389 Local Battery 66 Long Coil Magnet 361 Long Range Electro-magnet 220 Long Shunt and Series Winding 579 Long Shunt Winding 579 Loop 332 Loop Break 332 Loop, Circuit 125 Loop, Drip 192 Lost Amperes 30 Lost Volts 571 Low Vacuum 557 Luces 332 Luminous Jar 332 Luminous Pane 401 Luminous Tube 550 Lux 332

M 332 Machine, Cylinder Electric 333 Machine, Electric, Wimshurst 577 Machine, Frictional Electric 333 Machine, Holtz Influence 334 Machine, Hydro-electric 293 Machine, Influence 334 Machine, Nairne's Electrical 389 Machine, Plate Electrical 417 Machine, Rheostatic 472 Machine, Toeppler-Holtz 334 Machine, Wimshurst 335 Mack 335 Magic Circle 119 Magne-crystallic Action 335 Magnet 335 Magnet, Anomalous 335 Magnet, Artificial 335 Magnet, Axial 336 Magnet, Bar 336 Magnet, Bell Shaped 336 Magnet Coils, Sheath for 481 Magnet, Compensating 336 Magnet, Compound 336 Magnet, Controlling 185, 336 Magnet, Damping 336 Magnet, Deflection of 337 Magnet, Directing 185 Magnet, Electro- 215, 337 Magnet, Equator of 337 Magnet, Field 337 Magnet, Haarlem 337 Magnet, Heating 286 Magnet, Horseshoe 337 Magnet, Ironclad 356 Magnet, Joule's Electro- 337 Magnet-keeper 361 Magnet, Lamination of 361 Magnet, Long Coil 361 Magnet, Natural 361 Magnet, Neutral Line of 361 Magnet, Normal 361 Magnet Operation 365 Magnet, Permanent 365 Magnet Pole 365 Magnet, Portative Power of 366 Magnet, Projecting Power of a 435 Magnet, Relay 457 Magnet, Simple 366 Magnet, Solenoidal 366 Magnet, Sucking 366 Magnet, Unipolar 366 Magnet Coil 336 Magnet Core 336 Magnet Poles, Secondary 366 Magnet Pole, Unit 366 Magnetic Adherence 338 Magnetic and Electro-magnetic Equipotential Surface 244 Magnetic Attraction 338 Magnetic Attraction and Repulsion, Coulomb's Law of 338 Magnetic Axis 338 Magnetic Azimuth 338 Magnetic Battery 338 Magnetic Bridge 338 Magnetic Circuit 340 Magnetic Circuit, Curve of Saturation of 174 Magnetic Concentration of Ores 340 Magnetic Concentrator 340 Magnetic Continuity 340 Magnetic Conductance and Conductivity 340 Magnetic Control 341 Magnetic Couple 341 Magnetic Creeping 341 Magnetic Curves 341 Magnetic Cut Out 175 Magnetic Declination 342 Magnetic Density 342 Magnetic Dip 342, 346 Magnetic Discontinuity 342 Magnetic Double Circuit 340 Magnetic Eye, Electro- 248 Magnetic Elements 342 Magnetic Elongation 344 Magnetic Equator 344 Magnetic False Poles 350 Magnetic, Ferro- 252 Magnetic Field, Intensity of a 306 Magnetic Field of Force 344 Magnetic Field, Uniform 345 Magnetic Figures 345 Magnetic Filament 345 Magnetic Fluid, North 357 Magnetic Fluids 345 Magnetic Flux 345 Magnetic Force 346 Magnetic Friction 295, 346 Magnetic Friction Gear 276 Magnetic Fluid, South 356 Magnetic Foci 259 Magnetic Gear 346 Magnetic Hysteresis 294 Magnetic Inclination 346 Magnetic Induction 302 Magnetic Induction, Apparent Coefficient of 346 Magnetic Induction, Coefficient of 346-349 Magnetic Induction, Dynamic 347 Magnetic Induction, Static 347 Magnetic Induction, Tube of 347 Magnetic Inductive Capacity 349 Magnetic Inertia 347 Magnetic Influence 346 Magnetic Insulation 347 Magnetic Intensity 348 Magnetic Lag 348 Magnetic Latitude 348 Magnetic Leakage 348 'Magnetic Limit 348 Magnetic Lines of Force 348 Magnetic Mass 349 Magnetic Matter 349 Magnetic Memory 349 Magnetic Meridian 349 Magnetic Moment 349 Magnetic Needle 349 Magnetic Needle, Declination of the 178 Magnetic Needle, Dip of 185 Magnetic Needle, Oscillation of a 397 Magnetic Output 399 Magnetic Parallels 349 Magnetic Permeability 349 Magnetic Perturbations 350 Magnetic Poles 350 Magnetic Potential 350, 431 Magnetic Proof Piece 350 Magnetic Proof Plane 350 Magnetic Quantity 350 Magnetic Reluctance 351, 458 Magnetic Reluctivity 351 Magnetic Remanence 358 Magnetic Repulsion 338 Magnetic Resistance 458 Magnetic Retentivity 351 Magnetic Rotatory Polarization 351 Magnetic Saturation 251 Magnetic Screen 351 Magnetic Self-induction 352 Magnetic Separator 352 Magnetic Shell 352 Magnetic Shell, Strength of 352 Magnetic Shield 353 Magnetic Shunt 353 Magnetic Storms 353 Magnetic Strain 354 Magnetic Stress 354 Magnetic Susceptibility 254, 359 Magnetic Tick 354 Magnetic Top 542 Magnetic Twist 354 Magnetic Vane Ammeter 27 Magnetic Variations 354 Magnetism, Ampere's Theory of 354 Magnetism, Blue 355 Magnetism, Components of Earth's 356 Magnetism, Creeping of 356 Magnetism, Decay of 356 Magnetism, Discharge of 356 Magnetism, Electro 220 Magnetism, Ewing's Theory of 356 Magnetism, Free 356 Magnetism, Hughes' Theory of 357 Magnetism, Lamellar Distribution of 357 Magnetism of Gases 357 Magnetism, Red 357 Magnetism, Residual 358 Magnetism, Solenoidal Distribution of 358 Magnetism, Sub-permanent 358 Magnetism, Terrestrial 358 Magnetism, Weber's Theory of 358 Magnetization by the Earth 359 Magnetization by Double Touch 358 Magnetization by Separate Touch 359 Magnetization by Single Touch 359 Magnetization, Coefficient of Induced 359 Magnetization Curve 172 Magnetization, Cycle of 360 Magnetization, Elias' Method of 360 Magnetization, Hoffer's Method of 360 Magnetization, Intensity of 360 Magnetization, Isthmus Method of 360 Magnetization, Jacobi's Method 360 Magnetization, Limit of 361 Magnetization, Maximum 361 Magnetization, Specific 361 Magnetization, Surface 356 Magnetizing Coil 127 Magneto 361 Magneto Bell 80 Magneto Call Bell 361 Magneto-electric 361 Magneto-electric Brake 362 Magneto-electric Generator 362 Magneto-electric Generator, or Dynamo, Flashing in a 257 Magneto-electric Key 315 Magneto-electric Telegraph 512 Magnetograph 363 Magneto-inductor 363 Magnetometer 363 Magnetometer, Differential 365 Magnetometry 364 Magneto-motive Force 365 Magnetophone 367 Magnetoscope 365 Magnifying Spring Ammeter 28 Magnus' Law 367 Main Battery 66 Main Battery Circuit 125 Main Circuit 125 Main or Standard Feeder 251 Mains, Electric 367 Make 367 Make and Break Current 164, 367 Make and Break Key 316 Make-induced Current 163 Malapterurus 367 Map, Declination 309 Map, Inclination 297 Map, Isoclinic 308 Map, Isodynamic 308 Map, Isogonic 309 Marié Davy's Battery 67 Marine Galvanometer 269 Mariner's Compass 142 Marked End or Pole 368 Marriage Joint 310 Mass, Electric 368 Mass, Magnetic 349 Master Clock 127 Mathematical Element 237 Matteueci's Experiment 369 Matter, Electric 368 Matter, Fourth State of 261 Matter, Magnetic 349 Matter, Radiant 368 Matter, Ultra Gaseous 551 Matthiessen's Meter-gram Standard Resistance,. 466 Matthiessen's Unit of Resistance 466 Matting, Electric Floor 369 Maximum Magnetization 361 Maxwell's Theory of Light 369 Mayer's Floating Magnet 370 Maynooth's Battery 67 Measurement, Absolute 8 Measurements 370 Mechanical Equivalent of Heat 286 Mechanical Energy 241 Mechanical Equivalent, Electro- 244 Medical Battery 67 Medium, Polarization of the 424 Meg or Mega 370 Meidinger's Battery 68 Memoria Technica, Ampére's 30 Memory, Magnetic 349 Mercury 371 Mercury Bichromate, Battery 63 Mercury Circuit Breaker 121 Mercury Cups 371 Mercury, Sulphate of, Battery 67 Mercurial Air Pump 16 Meridian, Astronomical 372 Meridian, Geographic 372 Meridian, Magnetic. 349 Merit, Figure of 256 Merit, Formula of 256 Metal, Gilding 277 Metallic Arc 39 Metallic Circuit 125 Metallochromes 392 Metallurgy, Electro- 222 Metals, Law of Intermediate 323 Meter. Alternating Current 373 Meter, Ampere and Volt, Galvanometer . 274 Meter, Balance Ampere 391 Meter Bridge 373 Meter Bridge, Slide 486 Meter Candle 374 Meter, Chemical Electric 375 Meter, Current 375 Meter, Electro-magnetic 375 Meter, Energy 375 Meter Gram Standard Resistance, Matthiesen's 466 Meter-millimeter 375 Meter-millimeter Unit of Resistance 466 Meter, Neutral Wire Ampere. 391 Meter, Quantity 445 Meters. Ampere 39 Meter, Thermal-Electric 375 Meter, Time Electric 375 Meter, Watt 375 Method, Broadside 89 Method, Deflection 178 Method, End on 238 Method, Idiostatic 295 Method, Multiple Wire 388 Method, Null 393 Method of Magnetization, Elias' 360 Method of Magnetization, Isthmus 360 Method of Magnetization, Jacobi's 360 Methven Standard or Screen 376 Mho, 376 Mica 376 Mica, Moulded 376 Micro 376 Micrometer 376 Micrometer, Arc 39, 376 Micrometer, Spark 470 Micron 376 Microphone 376 Microphone Relay 377, 457 Microscope. Photo-electric 410 Microtasimeter 377 Mil 379 Mil, Circular 379 Mil-foot 379 Mil-foot Unit of Resistance 467 Milli 379 Milligram 379 Millimeter 379 Milli-oerstedt 380 Mil, Square 379 Minute, Ampere- 30 Mirror Galvanometer. 271 Mixed Gases 275 mm. 380 Molar 380 Molar Energy 241 Molecular Affinity 380 Molecular Attraction 380 Molecular Bombardment 380 Molecular Chain 380 Molecular Energy 241 Molecular Heat 286 Molecular Rigidity 380, 473 Molecular Shadow 480 Molecule 380 Moment 381 Moment, Magnetic 349 Moment of Couple 544 Moment, Turning 544 Monophote Lamp 321 Mordey Effect 381 Morse Receiver 381 Morse Recorder 451 Morse Telegraph 512 Mortar, Electric 382 Motion, Currents of 167 Motograph, Electro- 229 Motor. Compound or Compound Wound,. 382 Motor, Differential 382 Motor, Dynamo 200 Motor, Electric 382 Motor, Electro- 229 Motor, Electro-motive Force 384 Motor-generator 384 Motor, Multiphase 384 Motor, Overtype 399 Motor, Prime 385 Motor, Pulsating 386 Motor, Pyromagnetic 442 Motor, Reciprocating 385 Motor, Series 386 Motor, Shunt 386 Moulded Mica 376 Moulding 58 Movable Secondary 477 Mud, Battery 68 Multiphase Currents 166 Multiphase Motor 384 Multiple 386 Multiple Arc 387 Multiple Arc Box 387 Multiple Connected Battery 68 Multiple-series 387, 480 Multiple Switch 501 Multiple Switch Board 387 Multiple Transformer 548 Multiple Winding 579 Multiple Wire Method 388 Multiplex Harmonic Telegraph 510 Multiplex Telegraph 514 Multiplex Telegraphy 388 Multiplier, Schweigger's 476 Multiplying Power 347, 349 Multiplying Power of a Shunt 388 Multipolar Armature 46 Multipolar Dynamo 200 Multipolar Electric Bath 57 Multipolar Winding 579 Muscular Pile 388 Mutual Electro-magnetic Induction 302 Mutual Electrostatic Induction 303 Mutual Induction, Coefficient of 301 Mutual Induction Protector 481 Myria 388

Nairne's Electrical Machine 389 Napierian Logarithms 389 Nascent State 389 Natural Currents 166, 389 Natural Magnet 361 Needle 389 Needle Annunciator 35 Needle, Astatic 50 Needle, Dipping 185 Needle, Magnetic 349 Needle, Orientation of a Magnetic 397 Needle of Oscillation 389 Needle Telegraph, Single 519 Needle, Telegraphic 389 Negative Charge 389 Negative Current 164 Negative Electricity 389 Negative, Electro- 229 Negative Element 390 Negative Feeder 251 Negative Lead of Brushes 324 Negative Plate 417 Negative Pole 425 Negative Potential 432 Negative Side of Circuit 125 Nerve and Muscle Current 164 Nerve Currents 390 Net Efficiency 205 Net, Faraday's 250 Network 390 Neutral Armature 46 Neutral Feeder 251 Neutral Line of Commutator 390 Neutral Line of Magnet 361 Neutral Point 421 Neutral Point of Commutator 390 Neutral Point, Thermo-electric 390 Neutral Relay Armature 46, 390 Neutral Temperature 390 Neutral Wire 390 Neutral Wire Ampere Meter 391 N. H. P. 391 Niaudet's Battery 61 Nickel 391 Nickel Bath 391 Night Bell 392 Nitric Acid Battery 68 Nobili's Rings 392 Nodal Point 422 Nodular Deposit 392 Nominal Candle Power 101 Non-conductor 392 Non-essential Resistance 465-467 Non-inductive Resistance 467 Non-polar Dynamo 200 Non-polarizable Electrodes 210 Non-Polarized Armature 46 Normal Magnet 361 North Magnetic Fluid 357 North Pole 392 North Seeking Pole 393 Null Method 393 Null Point 422

Occlusion 393 Oerstedt 394 Oerstedt's Discovery 394 Oerstedt, Milli- 380 Ohm 394 Ohmage 394 Ohm, B. A. 394 Ohm, Board of Trade 394 Ohm, Congress 395 Ohmic Resistance 394, 467 Ohm, Legal 395 Ohmmeter 395 Ohm, Rayleigh 396 Ohm's Law 396 Ohm, True 396 Oil Insulation 396 Oil Transformer 548 Old Armature, Siemens' 49 Olefiant Gas 397 Omnibus Bar 94 Omnibus Rod 94 Omnibus Wire 94 One Coil Electro-magnet 219 Open 397 Open Circuit 125 Open Circuit Battery 68 Open Circuit Induction 303 Open Circuit Oscillation 397 Open Coil Armature 46 Open Coil Dynamo 200 Opening Shock 482 Operation, Magnet 365 Opposed Current 164 Optics, Electro- 229 Orders of Currents 167 Ordinate 397 Ordinates, Axis of 54, 397 Ores, Electric Reduction of 453 Ores, Magnetic Concentration of 340 Organ, Electric 397 Orientation of a Magnetic Needle 397 Origin of Co-ordinates 397 Oscillation, Centre of 112 Oscillation, Electric 398 Oscillation, Needle of 389 Oscillation, Open Circuit 397 Oscillatory 23 Oscillatory Discharge 188 Oscillatory Displacement 398 Oscillatory Electro-motive Force 398 Oscillatory Impedance 297 Oscillatory Induction 398 Osmose, Electric 398 Outlet 399 Output 399 Output, Magnetic 399 Output, Unit of 399 Over-compounding 399 Over, Flashing 258 Overflow Alarm 18 Over-house Telegraph 515 Overload 399 Overtype Dynamo or Motor 399 Oxide of Copper Battery 68 Ozone 399

Pacinotti's Inductor 400 Pacinotti's Ring 400 Pacinotti Teeth 400 Page Effect 401 Page's Revolving Armature 47 Paillard Alloys 400 Palladium 401 Pane, Fulminating 262 Pane, Luminous 401 Pantelegraphy 402, 510 Paper Filaments 402 Parabola 402 Parabolic Reflector 402 Paraffine 402 Paraffine Wax 402 Paragrêles 403 Parallax 403 Parallel 403 Parallel Circuits 123-126 Parallelogram of Forces 260 Parallels, Magnetic 349 Paramagnetic 403 Paramagnetism 404 Parasitical Currents 163 Parchmentizing 404 Partial Current 164 Partial Earth 203, 404 Partial Vacuum 557 Passive State 404 Path, Alternative 24 P. D. 404 Peltier's Cross 405 Peltier Effect 404 Pen, Electric 405 Pendant Cord 405 Pendulum Circuit Breaker 121 Pendulum, Electric 405 Pendulum or Swinging Annunciator 35 Pentane Standard, Harcourt's 406 Pentode Working 581 Percussion, Centre of 112 Perforated Armature 45 Perforated Core Discs 154 Perforator 407 Period 407 Period, Vibration 560 Periodic 23 Periodic Current, Power of 433 Periodicity 262, 408 Peripolar Zone 582 Permanency 408 Permanent Magnet 365 Permanent Magnet Ammeter 28 Permanent State 408 Permeability 346-349 Permeability-temperature Curve, 174 Permeameter 408 Permeance 408 Peroxide of Lead Battery 69 Perturbations, Magnetic 350 Pflüger's Law 409 Phantom Wires 409 Phase 409 Phase, Retardation of 471 Phenomenon, Porret's 427 Pherope 409, 527 Philosopher's Egg 409 Phonautograph, 409 Phone 409 Phonic Wheel 409 Phonograph 410 Phonophone or Rate Governor, Langdon Davies' 450 Phonozenograph 410 Phosphorescence 410 Phosphorous, Electrical Reduction of 410 Photo-electric Microscope 410 Photo-electricity 410 Photo-electro-motive Force 410 Photometer 411 Photometer, Actinic 411 Photometer, Bar 411 Photometer, Bunsen's 412 Photometer, Calorimetric 412 Photometer, Dispersion 412 Photometer, Shadow 414 Photometer, Translucent Disc 412 Photophore 415 Photo-voltaic Effect 415 Physical Energy 241 Physiology, Electro- 231 Piano, Electric 415 Pickle 415 Picture, Electric 415 Piece, Bed 78 Piece, Magnetic Proof 350 Piece, Pole 423 Pierced Core-discs, 152 Pile 415 Pile, Differential Thermo-electric 533 Pile, Muscular 388 Pile or Battery, Thermo-electric 530 Pilot Brush 91 Pilot Lamp 323 Pilot Transformer 415 Pilot Wires 415 Pistol, Electric 416 Pith 416 Pith Ball Electroscope 234 Pith-balls 416 Pivoted Armature 47 Pivot Suspension 416 Plane, Magnetic Proof 350 Plant 417 Plant Electricity 417 Plant, Isolated 309 Planté's Secondary Battery, 72 Plate, Arrester 417 Plate Condenser 417 Plate, Earth 203 Plate Electrical Machine 417 Plate, Franklin's 262 Plate, Generating 277 Plate, Ground 417 Plate, Negative 417 Plate, Positive 277, 417 Plating Balance 417 Plating Bath 418 Plating, Electro- 418 Platinized Carbon Battery 69 Platinoid 418 Platinum 419 Platinum Alloy 419 Platinum Black 419 Platinum Silver Alloy 419 Platinum Sponge 419 Play, End 238 Plow 420 Plücker Tubes 420 Plug 420 Plug Cut Out 175 Plug, Double 191 Plug, Grid 420 Plug, Infinity 305, 420 Plug Key 316 Plug Switch 420 Plumbago 421 Plunge Battery 69 Plunge 421 Plunger and Coil 131 Plunger and Coil, Differential 132 Plunger, Coil and 131 Plunger Electro-magnet 220 Pneumatic Battery 69 Pneumatic Signals, Electro- 231 P.O. 421 Pockets, Armature 47 Poggendorf's Solution 421 Point, Contact 147 Point, Indifferent 421 Point, Neutral 421 Point. Nodal 422 Point, Null 422 Point of Commutator, Neutral 390 Point Poles 422 Points, Consequent 422 Points, Corresponding 422 Points, Iso-electric 422 Points of Derivation 180, 423 Point, Thermo-electric Neutral 390 Polar Angle 423 Polar Extension 423 Polarity, Diamagnetic 181, 423 Polarity, Resultant 470 Polarization 423 Polarization, Back Electro-motive force of 156 Polarization Capacity 424 Polarization, Dielectric 183 Polarization, Galvanic 265 Polarization, Magnetic Rotary 351 Polarization of the Medium 424 Polarized Armature 47 Polarized Electro-magnet 220 Polarized Relay 458 Polarized Relay, Tongue of 542 Polarizing Current 164 Polar Region 424 Polar Span 424 Polar Span, Angle of 32, 423 Polar Tips 423 Polar Zone 582 Pole, Analogous 31, 425 Pole, Antilogous 425 Pole, Armature 47 Pole, Austral 54 Pole, Boreal 85 Pole Brackets, Telegraph 515 Pole Changer 425 Pole Changing Switch, 501 Pole Dynamo, Interior 199 Pole, Magnet 366 Pole, Negative 425 Pole, North 392 Pole, North-seeking 393 Pole or End, Marked 368 Pole Piece 423 Pole Pieces 425 Pole, Positive 425 Pole, Salient 426 Pole, Terminal 529 Pole Tips 290, 426 Pole, Traveling 426 Pole, Unit Magnet 366 Poles 425 Poles, Compensating 426 Poles, Consequent 146 Poles, Idle 296 Poles, Magnetic 350 Poles, Magnetic, False 350 Poles of Intensity 426 Poles of Verticity 426, 560 Poles, Point 422 Poles, Secondary 478 Poles, Secondary Magnet 366 Polyphase Currents 167 Polyphote Lamp 323 Popgun, Electric 282 Porous Cell 427 Porous Cup 159, 426 Porret's Phenomenon 427 Portative Power of Magnet 366 Portelectric Railroad 427 Portrait, Electric 415 Position, Energy of 241 Position Finder 427 Position, Sighted 484 Positive Current 164 Positive Direction 428 Positive Electricity 428 Positive Element 277 Positive Feeder 251 Positive Plate 277, 417 Positive Pole 425 Positive Potential 432 Positive Side of Circuit 125 Post Office 428 Posts, Binding, or Screws 81 Potential 428 Potential, Absolute 428 Potential, Constant 429 Potential Difference, Contact 147 Potential Difference, Electric 429 Potential Difference, Electro-motive 429 Potential, Electric Absolute 429 Potential, Fall of 430 Potential Galvanometer 269 Potential in Armature, Curve of Distribution of 172 Potential, Magnetic 350, 431 Potential, Negative 432 Potential or Static Energy 241 Potential, Positive 432 Potential Regulation, Constant 455 Potential, Unit of Electric 432 Potential, Zero 432, 582 Potentiometer 432 Poundal 433 Pound-foot 259 Power 438 Power, Candle 100 Power, Directive 187 Power, Electric 433 Power, Horse 290 Power, Illuminating 296 Power, Multiplying 349 Power of Magnet, Portative 366 Power of Periodic Current 433 Powers of Ten 527 Power, Stray 495 Power, Thermo-electric 533 Press Button 94 Pressel 434 Pressure 434 Pressure, Electric 434 Pressure, Electrification by 434 Primary 434 Primary Ampere-turns 31, 551 Primary Battery 69, 434 Prime 434 Prime Conductor 146, 434 Prime Conductor, Coatings of a 129 Prime Motor 385 Principle, Gauss' 276 Printing Telegraph 515 Probe, Electric 435 Projecting Power of a Magnet 435 Prony Brake 435 Proof Piece, Magnetic 350 Proof-plane 436 Proof Plane, Magnetic 350 Proof-sphere 436 Proportional Galvanometer 269 Proportionate Arms 436 Prostration, Electric 437 Protector, Body 84 Protector, Comb 437 Protector, Electric 437 Pull 437 Pulsatory Current 164 Pulsatory Field 256 Pulsating Motor 386 Pulvermacher's Electro-medical Battery 69 Pump, Geissler 437 Pump, Sprengel 439 Pump, Swinburne 440 Pumping 439 Puncture-electro 232 Puncture-galvano 232 Push Button 93. 98, 440 Push, Desk 180 Push, Floor 258 Pyro-electricity 441 Pyromagnetic Generator 442 Pyromagnetic Motor 441 Pyromagnetism 443 Pyrometer, Siemens' Electric 443

Q 443 Quad 288, 443 Quadrant 288, 443 Quadrantal Deviation 180 Quadrant, Legal 444 Quadrant, Standard 444 Quadrature 444 Quadruplex Telegraph 515 Qualitative 444 Quality of Sound 444 Quantitative 444 Quantity 444 Quantity Armature 47 Quantity, Electric 444 Quantity, Electro-magnetic 445 Quantity, Electro-magnetic, Practical Unit of 445 Quantity, Electrostatic 445 Quantity Galvanometer 269 Quantity, Magnetic 350 Quantity Meter 445 Quartz 445 Quicking 446

R 446 Racing of Motors 446 Radial Armature 47 Radian 446 Radiant Energy 446 Radiant Matter 368 Radiation 446 Radicals 446 Radiometer 447 Radiometer, Electric 447 Radio-micrometer 447 Radiophony 447 Railroad, Portelectric 427 Range Finder 447 Rate Governor 449 Rate Governor or Phonophone, Langdon Davies' 450 Rated Candle Power 101 Ratio Arms 437 Ratio, Core 154 Ratio, Shunt 483 Ratio, Velocity 560 Ray, Electric 450 Rayleigh Ohm 396 Reaction Coil 132 Reaction of a Dynamo Field and Armature 450 Reaction of Degeneration 179 Reactions, Anodic 36 Reactions, Armature 47 Reaction Telephone 527 Reaction Wheel 259 Reading Galvanometer, Direct 269 Reading, Sound 489 Reading Telescope 450 Real Efficiency of Secondary Battery 205 Real Hall Effect 284 Réaumur Scale 450 Recalescence 451 Receiver 451 Receiver, Harmonic 284, 451 Receiver, Morse 381 Receptive, Electro- 232 Recharge 115 Reciprocal 451 Reciprocating Motor 385 Recoil Circuit 125 Recorder, Chemical 117 Recorder, Morse 451 Recorder, Siphon 452 Record, Telephone 451 Rectification of Alcohol, Electric 18 Rectified Current 164 Rectilinear Current 165 Red Varnish 559 Red Magnetism 357 Redressed Current 165 Reduced Resistance 467 Reducteur for Ammeter 453 Reducteur for Voltmeter 453 Reduction of Ores, Electric 453 Reduction of Phosphorous, Electrical 410 Reflecting Galvanometer 270 Reflector, Parabolic 402 Refraction, Electric Double 454 Refraction, Electrostatic 235 Refreshing Action 454 Region, Extra-polar 454 Region, Intrapolar 307 Region, Polar 424 Register, Electric 454 Register, Telegraphic 454 Regulation, Constant Current 454 Regulation, Constant Potential 455 Regulation of Alternating Current Dynamo 195 Regulation of Dynamos 455 Reguline 456 Relative 456 Relative Calibration 98 Relay 456 Relay Bell 80 Relay Bells 457 Relay, Box Sounding 457 Relay Connection 457 Relay, Differential 457 Relay Magnet 457 Relay, Microphone 377, 457 Relay, Neutral, Armature 390 Relay, Polarized 457 Reluctance 458 Reluctance, Magnetic 351, 458 Reluctance, Unit of 438 Reluctivity 459 Reluctivity, Magnetic 351 Remanence 459 Remanence, Magnetic 358 Removal of Hair by Electrolysis 283 Renovate 115 Repeater 459 Repeater, Telegraph 518 Replenisher, Sir Wm. Thomson's 459 Repulsion, Magnetic 338 Repulsion and Attraction, Electrostatic 234 Repulsion and Attraction, Electro-magnetic 217 Reservoir, Common 460 Residual Atmosphere 460 Residual Capacity 103 Residual Charge 116 Residual Magnetism 358 Residue, Electric 116, 460 Resin 460 Resinous Electricity 461 Resistance 461 Resistance, Apparent 297, 462 Resistance, Assymmetrical 462 Resistance Box 462 Resistance, B. A. Unit of 462 Resistance Box, Sliding 463 Resistance, Breguet Unit of 463 Resistance Bridge 577 Resistance Coil 137 Resistance Coil, Standard 464 Resistance, Carbon 463 Resistance, Combined 464 Resistance, Compensating 144 Resistance, Critical 464 Resistance, Dielectric 183, 464 Resistance, Digney Unit of 464 Resistance, Electrolytic 464 Resistance, English Absolute or Foot-second Unit of 465 Resistance, Equivalent 465 Resistance, Essential 465 Resistance, External 465 Resistance Frame 465 Resistance, German Mile Unit of 466 Resistance, Hittorf's 466 Resistance, Inductive 466 Resistance, Insulation 466 Resistance, Internal 466 Resistance, Jacobi's Unit of 466 Resistance, Joint 464 Resistance, Magnetic 351, 458 Resistance, Matthiessen's Meter-gram Standard of 466 Resistance, Matthiessen's Unit of 466 Resistance, Meter-millimeter Unit of 466 Resistance, Mil-foot Unit of 467 Resistance, Non-essential 465, 467 Resistance, Non-inductive 467 Resistance of Human Body 467 Resistance, Ohmic 394, 467 Resistance, Reduced 467 Resistance, Siemens' Unit of 467 Resistance, Specific 467 Resistance. Specific Conduction 467 Resistance, Spurious 467 Resistance, Steadying 468 Resistance, Swiss Unit of 468 Resistance, Thomson's Unit of 468 Resistance to Sparking 490 Resistance, True 467 Resistance, Unit 468 Resistance, Unit of, B. A. 78 Resistance, Varley's 559 Resistance, Varley's Unit of 468 Resistance, Virtual 297 Resistance, Weber's Absolute Unit 468 Resolution of Forces 261 Resonator, Electric 468-470 Rest, Currents of 167 Resultant 470 Resultant Polarity 470 Retardation 470 Retardation of Phase 471 Retentivity 471 Retentivity, Magnetic 351 Retort Carbon 471 Return 471 Return Circuit 125 Return, Earth 203 Return Stroke 55 Reversal, Thermo-Electric 533 Reverse Current Working 581 Reverse-induced Current 163 Reverser, Current 165 Reversibility 471 Reversible Bridge 472 Reversing Key 316 Reversing Switch 501 Revivify 115 Revolving Armature, Page's 47 Rheochord 472 Rheometer 472 Rheomotor 472 Rheophore 472 Rheoscope 472 Rheoscopic Frog 262 Rheostat 472 Rheostat Arm 472 Rheostatic Machine 472 Rheostat, Wheatstone's 472 Rheotome 473 Rheotrope 473 Rhigolene 473 Rhumbs 473 Rhumkorff Coil 138, 473 Ribbon Coil 138 Ribbon Core 154 Right-handed Screw Law 324 Rigidity, Molecular 380, 473 Ring, Ampere 30 Ring Armature 48 Ring. Collecting 139 Ring Contact 473 Ring Core 155 Ring, Dynamo 200 Ring, Faraday's 473 Ring, Foundation 261 Ring, Guard 282 Ring, Pacinotti's 400 Rings, Electric 392 Rings, Nobili's 392 Ring, Split, Commutator 141 Roaring 474 Rocker 474 Rocker Arms 50, 474 Rod, Bus 94 Rod, Discharging 189 Rod, Omnibus 94 Roget's Spiral 474 Rolling Armature 49 Rosin 460 Rotary Polarization, Magnetic 351 Rotating Brush 91 Rotating Field 256 Rotation of Liquids, Electro-dynamic 474 Rotation of Liquids, Electro-magnetic 475 Rotatory Currents 167 Rubber 102, 475 Rubber, India 102

Saddle Bracket 475 Safety Catch 175 Safety Cut Out 175 Safety Device 475 Safety Fuse 175, 475 Safety Fuse, Plug, or Strip 475 Sal Ammoniac Battery 69 Salient Pole 426 Salt 475 Salt, Dronier's 192 Salt or Sea-salt Battery 69 Sand Battery 90 Saturated 476 Saturation, Magnetic 351 Saw, Electric 476 Scale, Fahrenheit 248 Scale, Réaumur 450 Scale, Tangent 502 Schweigger's Multiplier 476 Scratch Brushes 476 Screen, Electric 476 Screen, Magnetic 351 Screen, Methven 376 Screws or Posts, Binding 81 Sealed, Hermetically 289 Sea Salt or Salt Battery 69 Secohm 288 Second, Ampere- 30 Secondary Actions 477 Secondary Ampere-turns 31, 551 Secondary Battery 70 Secondary Battery, Efficiency of, Quantity 205 Secondary Battery, Planté's 72 Secondary Clock 127 Secondary Current 166 Secondary Generator 277, 477 Secondary Magnet Poles 366 Secondary, Movable 477 Secondary Plates, Colors of 478 Secondary Poles 478 Secretion Current 166 Section Trolley 549 Sectioned Coils 138 Seebeck Effect 478 Segments 56 Segments, Commutator 56 Selenium 478 Selenium Cell 478 Selenium Eye 478 Self-exciting Dynamo 201 Self-induction 303 Self-induction, Magnetic 352 Self-induction, Unit of 304 Self-repulsion 478 Self-winding Electric Clock 128 Semi-circular Deviation 181 Semi-conductors 478 Semi-incandescent Lamp 323 Sender, Zinc 582 Sensibility 479 Sensitiveness, Angle of Maximum 479 Separate Circuit Dynamo 201 Separate Touch 359, 479 Separate Touch, Magnetization by 359 Separately Excited Dynamo 201, 479 Separation of Electricities 479 Separator 479 Separator, Magnetic 352 Series 479 Series and Long Shunt Winding 579 Series and Separate Coil Winding 579 Series and Short Shunt Winding 580 Series, Contact 147 Series Dynamo 201 Series, Electro-chemical 209 Series, Electro motive 228 Series, Electrostatic 235 Series Motor 386 Series, Multiple- 387 Series-multiple 480 Series, Thermo-electric 534 Series Transformer 548 Series Winding 579 Service Conductors 480 Serving 480 Shackle 480 Shadow, Electric 480 Shadow, Molecular 480 Shadow Photometer 414 Sheath for Magnet Coils 481 Sheath for Transformers 481 Sheath, Induction 303 Sheet Current 166 Shell, Magnetic 352 Shell, Strength of Magnetic 352 Shellac 481 Shellac Varnish 481 Shield, Anti-magnetic 37 Shield, Magnetic 351, 353 Shielded 481 S. H. M. 482 Shock, Back, or Stroke of Lightning 55 Shock, Break 482 Shock, Electric 482 Shock, Opening 482 Shock, Static 482 Short Circuit 482 Short Circuit Working 482 Short Fall Air Pumps 16 Short Shunt Winding 579 Shovel Electrodes 483 Shower Bath, Electric 57 Shunt 483 Shunt Box 483 Shunt Circuit 123, 126 Shunt Dynamo 202 Shunt, Electro-magnetic 483 Shunt, Galvanometer 271, 483 Shunt, Magnetic 353 Shunt Motor 386 Shunt. Multiplying Power of a 388 Shunt Ratio 483 Shunt Winding 580 Shuttle Armature 49 Shuttle Current 483 Shuttle Winding 483, 580 Side Flash 484 Siemens and Halske's Battery 72 Siemens' Differential Voltameter 564 Siemens' Electro-dynamometer 212 Siemens' Old Armature 49 Siemens' Unit of Resistance 467 Sighted Position 484 Signaling, Velocity of 560 Signals, Electro-pneumatic 231 Signal, Telegraph 519 Silent Discharge 187, 189, 206 Silver 484 Silver Bath 484 Silver, German 277 Silver Stripping Bath 484 Silver Voltameter 565 Simple Arc 39 Simple Circuit 126 Simple Harmonic Motion 486 Simple Immersion 185 Simple Magnet 366 Simple Substitution 485 Sims-Edison Torpedo 543 Sine Curve 174, 485 Sine Galvanometer 271 Sine Law 486 Sines, Curve of 173, 485 Single Coil Dynamo 202 Single Curb Working 581 Single Fluid Theory 486 Single Fluid Voltaic Cell 486 Single Needle Telegraph 519 Single Touch, Magnetization by 359 Sinistrotorsal 486 Sinuous Current 166 Sinusoidal Curve 174, 485 Siphon Recorder 452 Sir William Thomson's Battery 72 Skin Effect 486 Skrivanow Battery 72 Sled 486 Sleeve, Joint 310 Slide, Balance 374 Slide Bridge 374 Slide Meter Bridge 486 Sliding Condenser 144 Sliding-contact Key 316 Sliding Resistance Box 463 Slope, Lines of 330 Smee's Battery 73 S. N. Code 486 Snap Switch 501 Soaking-in-and-out 486 Socket, Lamp 323 Socket, Wall 572 Soldering, Electric 487 Solenoid 487 Solenoid Ammeter 28 Solenoidal Distribution of Magnetism 358 Solenoidal Magnet 366 Solid Earth 203 Solutions, Battery, Chromic Acid 73 Solution, Chutaux's 119 Solution, Delaurier's 179 Solution, Hittorf's 289 Solution, Kookogey's 318 Solution, Poggendorf's 421 Solution, Striking 496 Solution, Tissandier's 542 Solution, Trouvé's 549 Sonometer, Hughes' 488 Sonorescence 488 Sound, Characteristics of 114 Sounder 488 Sounders, Tin 542 Sound, Quality of 444 Sound Reading 489 South Magnetic Fluid 356 Space, Clearance 489 Space, Crookes' Dark 489 Space, Dark, Faraday's 249, 489 Space, Faraday's Dark 249, 489 Space, Inter-air 489 Space, Interferric 489 Span, Polar 424 Span, Polar, Angle of the 32 Spark Arrester 489 Spark Coil 489 Spark Discharge 189 Spark, Duration of Electric 490 Spark Gap 490 Spark, Length of 490 Spark Micrometer 470 Spark Tube 491 Sparking 490 Sparking Distance 190 Sparking, Lines or Points of Least 490 Sparking, Resistance to 490 Specific Conduction Resistance 467 Specific Conductivity 145 Specific Heat 286 Specific Heat of Electricity 491 Specific Inductive Capacity 103 Specific Magnetization 361 Specific Resistance 467 Speech, Articulate 50 Speed, Critical 157 Spent Acid 491 Spent Liquor 491 Spherical Armature 49 Spherical Candle Power 101 Spherical Illuminating Power 296 Sphygmophone 491 Sphygmophone, Electric 491 Spiders 491 Spiral 492 Spiral Battery 73 Spiral, Roget's 474 Spiral Winding 492 Spirit Compass 143 Splayed Joint 311 Splice Box 492 Split Battery 73 Split Ring Commutator 141 Spluttering 492 Sponge, Platinum 419 Spot, Grease 92 Sprengel Pump 439 Spring Ammeter 28 Spring and Fibre Suspension 252 Spring-contact 148 Spring Control 492 Spring Jack Cut-out 493 Spurious Hall Effect 284 Spurious Resistance 467 Spurious Voltage 493 Square Mil 379 Square Wire 493 Squares, Law of Inverse 323 St. Elmo's Fire 494 Staggering 493 Standard Candle 101 Standard Candle, German 99 Standard, Harcourt's Pentane 406 Standard, Methven 376 Standard of Illuminating Power, Viole's 561 Standard or Main Feeder 251 Standard Quadrant 444 Standard Resistance Coil 464 Standard Voltaic Cell 109 Standard Voltaic Cell, Daniell's 109 Standard Voltaic Cell, Latimer Clark's. 110 State, Electrotonic 493 State, Nascent 389 State of Matter, Fourth 261 State, Passive 404 State, Permanent 408 Static Breeze 493 Static Condenser, Armature of 46 Static Electricity 493 Static Hysteresis 295 Static Induction, Magnetic 347 Static Shock 482 Station, Central 493 Station, Distant 493 Station, Home 493 Station, Transforming 494 Steadying Resistance 468 Steel 494 Steeling 494 Steel Yard Ammeter 28 Step-by-step Telegraph 506 Step-by-step Telegraphy 494 Step-down 494 Step, Foot- 259 Sticking 494 Stool, Insulating 305 Stopped Coil Electro-magnets 221 Stopping Off 495 Storage Battery 70 Storage Battery Changing Switch 501 Storage Battery, Planté's 72 Storage Capacity 105, 495 Storage of Electricity 495 Storms, Electric 495 Storms. Magnetic 353 Strain 495 Strain, Dielectric 183 Strain, Magnetic 354 Stranded Conductor Armature 49 Stranded Core 155 Stray Field 256, 495 Stray Power 495 Streamlets. Current 495 Strength, Dielectric 183 Strength of Magnetic Shell 352 Stress 495 Stress, Dielectric 496 Stress, Electro-magnetic 219, 496 Stress, Electrostatic 236, 496 Stress, Energy of 241 Stress, Magnetic 354 Striae, Electric 496 Striking Distance 496 Striking Solution 496 Stripping 496 Stripping Bath 57 Stripping Bath, Gold 279 Stripping Bath, Silver 484 Stroke, Back 55 Stroke or Shock of Lightning, Back 55 Stroke, Return 55 Sub-branch 496 Sub-main 496 Sub-permanent Magnetism 358 Substitution, Simple 485 Subway, Electric 496 Successive Temperatures, Law of 324 Sucking Coil 182 Sucking Magnet 366 Sulphate of Lead Battery 66 Sulphate of Mercury Battery 67 Sulphating 497 Sulphur Dioxide 497 Sulphuric Acid 497 Sulphuric Acid Voltameter 564 Sulphurous Acid Gas 497 Sunstroke, Electric 497 Superficial Density, Electric 180 Supersaturated, 497 Supply, Isolated 309 Surface 497 Surface Density 498 Surface, Equipotential 498 Surface Leakage 498 Surface Magnetization 356 Surgical Electro-magnet 222 Surging Discharge 188 Surveyors' Compass 143 Susceptibility, Magnetic 354, 359 Suspension 498 Suspension, Bifilar 498 Suspension, Fibre 252 Suspension, Knife Edge 317 Suspension, Pivot 416 Suspension, Spring and Fibre 252 Suspension, Torsion 545 Suspension Wire of Cable 97 Swaging. Electric 499 Swelling Current 167 S. W. G. 499 Swinburne Pump 440 Swinging Earth 203 Swinging or Pendulum Annunciator 35 Swiss Unit of Resistance 468 Switch 499 Switch, Automatic 500 Switch Board 500 Switch Board, Multiple 387 Switch Board, Trunking 550 Switch, Break-down 88 Switch, Changing 500 Switch, Changing Over 500 Switch, Circuit Changing 500 Switch, Double Break 500 Switch, Double Pole 500 Switch Feeder 500 Switch, Knife 501 Switch, Knife Break 501 Switch, Knife Edge 501 Switch, Multiple 501 Switch, Plug 420 Switch, Pole Changing 501 Switch, Reversing 501 Switch, Snap 501 Switch, Storage Battery Changing 501 Switch, Three Way 501 Switches, Distributing 190 Symmer's Theory 191 Sympathetic Vibration 501, 561 System, Block 83 System of Co-ordinates 150 System, Tower 545

T 501 Tailing Current 501 Tailings 501 Talk, Cross 158 Tamidine 502 Tangent Galvanometer 272 Tangent Law 502 Tangent Positions of, Gauss 276 Tangent Scale 502 Tangentially Laminated Core 155 Tank, Cable 97 Tape, Insulating 305 Tapper Key, Double 314 Teazer 504 Technica, Memoria, Ampére's 30 Tee, Lead 504 Teeth, Pacinotti 400 Tel-autograph 504 Tele-barometer, Electric 504 Telegraph, A. B. C. 504 Telegraph, Autographic 510 Telegraph, Automatic 504 Telegraph, Dial 505 Telegraph, Double Needle 506 Telegraph, Duplex 506 Telegraph, Duplex, Bridge 506 Telegraph, Duplex, Differential 507 Telegraph Embosser 237 Telegraph, Facsimile 510 Telegraph, Harmonic Multiplex 510 Telegraph. Hughes' 511 Telegraph Insulator 306 Telegraph Key 316 Telegraph, Magneto-electric 512 Telegraph, Morse 512 Telegraph, Multiplex 514 Telegraph, Single Needle 519 Telegraph, Overhouse 515 Telegraph Pole Brackets 515 Telegraph, Printing 515 Telegraph, Quadruplex 515 Telegraph Repeater 518 Telegraph Signal 519 Telegraph, Step-by-step 506 Telegraph, Wheatstone's, A. B. C. 521 Telegraph. Writing 521 Telegraphic Alphabet 19 Telegraphic Code 130, 511 Telegraphic Needle 389 Telegraphic Register 454 Telegraphy, Multiplex 388 Telegraphy, Step-by-step 494 Telemanometer, Electric 521 Telemeter, Electric 521 Telepherage 522 Telephone 522 Telephone, Bi- 524 Telephone, Capillary 525 Telephone, Carbon 525 Telephone, Chemical 526 Telephone, Electrostatic 526 Telephone Exchange 246 Telephone Induction Coil 137, 526 Telephone, Reaction 527 Telephone Record 451 Telephone, Thermo-electric 527 Telephone Tinnitus 542 Telephotography 521 Telephote 527 Telescope, Reading 450 Teleseme 527 Tele-thermometer 527 Terminal 529 Terminal Pole 529 Terminal Voltage 562 Temperature, Absolute 8 Temperature, Neutral 390 Temperatures, Laws of Successive 324 Tempering, Electric 527 Temporary Magnetism or Magnetization 357 Ten, Powers of 527 Tension 529 Tension, Disruptive 189 Tension, Electric 529 Terrestrial Magnetism 358 Tetanus, Acoustic 529 Tetrode Working 581 Theatrophone 529 Theory, Contact 148 Theory, Double Fluid 191 Theory, Franklin's 262 Theory of Dimensions 184 Theory of Light, Electro-magnetic 219 Theory of Light, Maxwell's 369 Theory of Magnetism, Ampére's 354 Theory of Magnetism, Ewing's 356 Theory of Magnetism, Hughes' 357 Theory of Magnetism, Weber's 358 Theory, Symmer's 191 Therapeutic Electrode 210 Therapeutics, Electro- 236 Therm 529 Thermaesthesiometer 530 Thermal Electric Meter 375 Thermal Equivalent, Electro- 245 Thermal Energy 242 Thermic Balance 85 Thermo Call 530 Thermo-chemical Battery 530 Thermo-chemical Equivalent 245 Thermo-electric Battery or Pile 530 Thermo-electric Call 531 Thermo-electric Couple 532 Thermo-electric Current 167 Thermo-electric Diagram 532 Thermo-electric Element 237 Thermo-electric Inversion 533 Thermo-electric Junction 533 Thermo-electric Neutral Point 390 Thermo-electric Pile, Differential 533 Thermo-electric Power 533 Thermo-electric Reversal 533 Thermo-electric Series 534 Thermo-electric Telephone 527 Thermo-electric Thermometer 535 Thermo-electricity 533 Thermo-electricity, Laws of, Becquerel's 78 Thermo-electricity, Volta's Law of 568 Thermo-electrometer 536 Thermolysis 535 Thermo-multiplier 536 Thermometer 535 Thermometer, Electric 535 Thermometer, Kinnersley's 536 Thermometer, Tele- 527 Thermometer, Thermo-electric 535 Thermophone 537 Thermostat, Electric 537 Third Brush 91 Thomson Effect 538 Thomson's Replenisher, Sir William 459 Thomson's Battery, Sir William 72 Thomson's Unit of Resistance 468 Three Filament Incandescent Lamp 322 Three Way Switch 501 Three Wire System 539 Throw 237, 540 Throw-back Indicator 540 Thrust Bearings 540 Thunder 540 Ticker 540 Tick, Magnetic 354 Timbre 444 Time Constant 541 Time Cut-outs 541 Time Electric Meter 375 Time-fall 541 Time-reaction 541 Time-rise 541 Tin 541 Tin Sounders 542 Tinnitus, Telephone 542 Tips, Polar 423 Tips, Pole 290, 426 Tissandier's Solution 542 Toeppler-Holtz Machine 334 Tongs, Cable Hanger 97 Tongs, Discharging 189 Tongue of Polarized Relay 542 Tongue of Polarized Relay, Bias of 542 Toothed Core-discs 154 Top, Magnetic 542 Torpedo, Electric 543 Torpedo, Sims-Edison 543 Torque 543 Torque, Curve of 174 Torricellian Vacuum 557 Torsion Balance, Coulomb's 544 Torsion Galvanometer 273, 544 Torsion Head 544 Torsion Suspension 545 Total Earth 203 Touch 545 Touch, Separate 479 Tourmaline 545 Tower, Electric 545 Tower System 545 Trailing Horns 259 Transformer 545 Transformer, Commuting 547 Transformer, Continuous Alternating 547 Transformer, Continuous Current 384, 547 Transformer, Core 547 Transformer, Faraday's 250 Transformer, Hedgehog 548 Transformer, Multiple 548 Transformer, Oil 548 Transformer, Pilot 415 Transformer, Series 548 Transformer. Sheath for 481 Transforming Station 494 Transformer, Welding 548, 575 Translator 519 Translucent Disc Photometer 412 Transmitter 548 Transmitter, Carbon 549 Transmission of Energy, Electric 240 Transposing 549 Transverse Electro-motive Force 549 Trap, Bug 92 Traveling Pole 426 Trembling Bell 78 Trolley 549 Trolley, Double 549 Trolley Section 549 Trough Battery 73 Trouvé's Blotting Paper Battery 73 Trouvé's Solution 549 True Contact Force 549 True Ohm 396 True Resistance 467 Trimmer, Brush 549 Trumpet, Electric 550 Trunk Lines 550 Trunking Switch Board 550 Tube, Electric 550 Tube, Guard 282 Tube, Luminous 550 Tube of Magnetic Induction 347 Tube, Spark 491 Tube, Stratification 495 Tubes, Geissler 276 Tubes of Force 261 Tubes, Plücker 420 Tubular Braid 550 Tubular Core 155 Tubular Magnet 356 Tuning Fork Circuit Breaker 121 Tuning Fork Dynamo 202 Tuning Fork, Interrupter for 307 Turning Moment 544 Turns 550 Turns, Ampere- 31 Turns, Dead, of a Dynamo 551 Turns, Primary Ampere- 551 Turns, Secondary Ampere- 551 Twist Joint, American 309 Twist, Magnetic 354 Tyer's Battery 74 Typewriter, Electric 551 Type Printer, Hughes' 511

Ultra-gaseous Matter 551 Unbuilding 552 Underground Conductor 552 Underground Electric Subway 552 Undulatory 23 Undulatory Current 167 Unidirectional 553 Uniform Field 256 Uniform Field of Force 553 Uniform Magnetic Field 345 Unipolar 553 Unipolar Armature 50, 553 Unipolar Current Induction 553 Unipolar Dynamo 202-553 Unipolar Electric Bath 57 Unipolar Induction 304 Unipolar Magnet 366 Unit 553 Unit, Absolute 554 Unit Angle 554 Unit. B. A. 554 Unit, B. A., of Resistance 462 Unit Current 167 Unit Electro-motive Force 228 Unit, Fundamental 554 Unit Jar 554 Unit Magnet Pole 366 Unit of Capacity 105 Unit of Conductivity 145 Unit of Electric Potential 432 Unit of Energy, Electro-magnetic 220 Unit of Force 261 Unit of Illumination 296 Unit of Output 399 Unit of Reluctance 458 Unit of Resistance, B. A. 78 Unit of Resistance, Breguet 463 Unit of Resistance, Digney 464 U nit of Resistance, English Absolute or Foot-second 465 Unit of Resistance, German Mile 466 Unit of Resistance, Jacobi's 466 Unit of Resistance, Meter-millimeter. 466 Unit of Resistance, Mil-foot 467 Unit of Resistance, Siemens' 467 Unit of Resistance, Swiss 468 Unit of Resistance, Thomson's 468 Unit of Resistance, Varley's 468 Unit of Self-induction 304 Unit of Supply 554 Unit of Work 581 Unit Resistance 468 Units, Circular 126, 555 Units, Derived 555 Units, Heat 288 Units, Practical 555 Universal Battery System 556 Universal Discharger 189 Unmarked End 556 Upright Galvanometer 274 Upward's Battery 75